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为研究土与结构动力相互作用对偏心结构地震反应的影响规律,改进现有抗震设计,采用振动台试验方法对某单层偏心结构模型在刚性地基与桩筏基础条件下进行对比试验,对模型制作材料力学性能进行了测试,分析和比较了偏心结构位移响应组成关系。结果表明:地基刚度对结构自振特性的影响主要表现为振型间耦联反应程度的降低和体系阻尼比的增大;地基对基础的约束能力影响了上部结构振动反应的大小与组成,考虑相互作用的偏心结构平扭变形幅度降低,总位移反应增大;结构应变反应振动频率降低,振动持时缩短,场地土的阻尼特性加快了结构振动能量的耗散;当偏心率较小时,结构主要表现为单自由度体系变形特征,扭转耦联效应随之减弱。试验结果为后续理论研究提供了依据。
In order to study the influence of dynamic interaction between soil and structure on the seismic response of eccentric structures, the existing seismic design is improved. The shaking table test method is used to test a single-layer eccentric structure model under rigid foundation and piled raft foundation. The mechanical properties of the material were tested, and the displacement response of the eccentric structure was analyzed and compared. The results show that the influence of foundation stiffness on the natural vibration characteristics of the structure is mainly reflected by the decrease of the coupling reaction and the increase of the damping ratio of the foundation. The constraint capacity of the foundation affects the size and composition of the superstructure vibration response. The deformation amplitude of the eccentric structure decreases, the total displacement response increases; the vibration frequency of the structure strain reaction decreases, the vibration is shortened at the same time and the damping property of the site soil accelerates the dissipation of the vibration energy of the structure; when the eccentricity is small, the structure Mainly as a single degree of freedom system deformation characteristics, torsional coupling effect will be weakened. The test results provide the basis for the follow-up theoretical research.